Self-centering and gage-sawing device.



L M. THURLOW. SELF CENTERING AND GAGE SAWINGDEVICE. APPLICATION FILEDJUNE 14. 1915.

a SHEETS-SHEET 1.

Patented-Feb 81916.

THE COLUMBIA PLANOGRAPH 110., WASHINGTON. D. c.

I. M. THURLOW. I SELF CENTERING AND GAGE SAWIN G DEVICE.

Patented Feb. 8, 1916;

s SHEETS-SHEET 2. 7

APPLICATION FILED JUNE I4, 1915.

I. M. THURLO'W.

SELF CENTERING AND GAGE SAWING DEVICIZ.

APPLICATION FILED JUNE 14. 1 915. v I

- v Patented Feb. 8

1916. a SHEETS-SHET 3.

PIHJGRAPH c0-. WASHINGTON n c IRA, M. THURLOW, or Io r, w sceNsIN,ssIeNon TQ THE Bnn IN MACHINE WORKS, or BELOIT, wrscoNsr A CORPORATIONOF wIscoNsIN.

sELr-oE rEnINe AND eaGn-sAwINe DEVICE.

To all whom it may concern 7 Be it known that I, IRA THUBLOW, a citizenof; the United States, residing at Beloit, in the county of Rock andState of Wisconsin, have invented certain new and useful Improvements inSelf-Centering and Gage-Sawing Devices, of which the following isaspecification.

A band resaw is ordinarily supplied with. four power driven feed rollspositioned in pairs on each side of the saw. In Operation one pair ismade rigid for gage sawing to. produce a fixed thickness between therigid rolls vand the saw, the unevenness of the stock being taken careof by the other set of rolls which are ordinarily yielding. At othertimes it is desired to divide the unevenness of the stock and by linkingboth sets of rolls together cause themv to, move to positionsequidistant from the saw line. This is called self centering.

The object of this invention is toaccomplish either gage sawing or selfcentering in a convenient and practicable manner.

' In order that the invention may be readily understood a preferredembodiment of the same is set forth in the accompanying drawing and inthe description based thereon. As, however, the invention is susceptibleof embodiment in other constructional forms the drawing and descriptionare to be taken in an illustrative and not in an unnecessarily limitingsense.

In the drawingFigure 1 is a side elevation of so much of a band re-sawas will serve to illustrate the invention; Fig. 2 is a top plan viewpartly in section; Fig. 3 is an end view; and Fig. & is a detailsectional view on the line l l of Fig. 2.

The ordinarily rigid pair of feed rolls is indicated at 11-'11, and theyielding or adjustable feed rolls at 1212, mounted respectively upon thecarriages 13 and 1 1 to slide upon the machine frame indicated generallyat 15.

A pin 16 extendin upwardly from its seat in the machine frame serves asa pivot upon which swing two arms 17 and 18, the former having its freeend connected by means of the screw 19 with the yielding feed rollcarriage at 20, and being also connected by the link 21 with one end ofa rocking lever 22, the opposite end of which is connected with the rod23 controlled by double acting springs 24, 25, mounted upon Patentednet. 8, 1 :16.

Application filed June 14;, 131 5;, 3 Serial No. 34,065.

said rod between a central guiding abutment 26and the collars 27 and 28,a nut 29 being provided for the adjustment of the tension of thesprings.Theend of the screw 19 is squared at 19 inorder to. adjust the connec-;

tion' between the arm 17 and the feed roll carriage. The arm 18,likewise pivotally mounted upon the pin 16, is connected by means of thescrew spindle 30 at 31 with the fixed feed roll carriage 13. The spindle30 has. also a squared end 30 for purposes of adjustment.

The arm 18 of the fixed feed roll carriage has, in line with its pivotalmounting upon the pin 16, a pair of laterally extending ears 32, 32,upon which by means of the pivots 33are fulcrumed the members 34, 34, ofa pair of clamping levers each pro? vided equidistant from its fulcrumwith jaws 35, 36, the jaws 35. adapted to engage on the two side facesof the arm 17 and'the jaws 36 adapted to engage the two. side faces ofthelmachine frame 15. The extreme upper ends of the levers are connectedby means of a screw spindle 37 controlled by the hand wheel 38.

The operation is as follows: WVhere it is I desired to do gage sawingthe fixed feed rolls 11 are adjusted by means of the screw spindle 30and the hand wheel 38 is turned to spread apart the upper ends of theclamping levers 34 whereby the jaws 36 are caused to securely engage themachine frame and the arm 18 is thus locked rigidly to the machine frameso as to prevent any movement of the arm upon its pivot 16. It will beseen that under these circumstances the feed rolls 11 are rigidly heldwhile the feed rolls 12, having beenadjusted by means of the screwspindle 19, will yield slightly under the control of the springs 24:,25. If it is desired to self center the rolls they will be brought bymeans of the screw spindles 19 and 30 to a position equidistant from thesaw line or into such relation as the conditions of the work mayrequire, whereupon the hand wheel 38 will be turned in such manner as todraw theupper ends of the lever 34: together releasing the jaws 36 fromthe machine frame and causing the aws 35 to firmly grasp the arm 17 Itwill be seen that the two arms are now free to move independently of themachine frame, but are rigidly coupled together and left free to swingas an integral ,twoarmecl rec-king lever about the pivot 16 as a centerand subject only to the yielding resistance of the double acting springs24, 25.

I claim:

1. In a resaw, the combination with two sets of feed rolls arranged oneon each side of the saw, of two arms extending in a common plane, aconnection between each of the arms and one of the sets of feed rolls,one of the arms free to move and the other yieldingly supported, a pairof clamping levers suitably fulcrumed and embracing one of the arms atone side of their fulcrum and embracing a portion of the machine frameat the other side of the fulcrum, and adjustable means connecting theclamping levers whereby to alternatively anchor one of the arms leavingthe other free and to couple the two arms together to move in unison inopposite directions.

2. In a resaw, the combination with two sets of feed rolls arranged oneon each side of the saw, of two arms eXtending in a common plane, aconnection between each of the arms and one of the sets of feed rolls,one of the arms free to move and the other yieldingly supported, a pairof clamping levers fulcrumed to one of the arms and embracing the otherarm at one side of their fulcrum and embracing a portion of the machineCopies of this patent may be obtained for the'two arms together to movein unison in opposite directions.

3. In a resaw, the combination with two sets of feed rolls arranged oneon each side of the saw, of two arms oppositely extending from a commonpivot, a connection be- 4 tween each of the arms and one of the sets offeed rolls, one of the arms free to move and the other yieldinglysupported, a pair of clamping levers fulcrumed to one of the arms andembracing the other arm at one side of their fulcrum and embracing aportion of the machine frame at the other side of the fulcrum, a screwspindle connecting the clamping levers, whereby to alternatively anchorone of the arms leaving the other free and to couple the two armstogether to move in unison in opposite directions.

In Witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

IRA M. THURLON. l/Vitnesses:

LEWIS T. Gnnrs'r, MILTON T. MILLER.

five cents each, by addressing the Commissioner of Patents, Washington,D. C.

